CN102537632A - Variable displacement rotor oil pump - Google Patents

Abstract

The invention relates to a variable displacement rotor oil pump which comprises a pump cover, a pump case, a displacement adjusting structure and an intermediate cover plate, wherein the displacement adjusting structure comprises a centrifugal adjusting mechanism, a first inner rotor, a first outer rotor, a second inner rotor, a second outer rotor and a rotating shaft; an upper oil cavity is formed between the pump cover and the intermediate cover plate; the first inner rotor and the first outer rotor are matched with each other and are positioned in the upper oil cavity; a lower oil cavity is formed between the intermediate cover plate and the pump case; the second inner rotor and the second outer rotor are matched with each other and are positioned in the lower oil cavity; the lower oil cavity is divided to form a lower high-pressure oil area and a lower low-pressure oil area; the centrifugal adjusting mechanism, the first inner rotor and the second inner rotor rotate along with the rotating shaft; when the rotating speed of the rotating shaft is lower than the preset value, the oil in the lower high-pressure oil area is separated from the oil in the lower low-pressure oil area; and when the rotating speed of the rotating shaft is higher than the preset value, the rotating shaft and the second inner rotor are driven to rise upwards by the centrifugal force of the centrifugal adjusting mechanism, and the oil in the lower high-pressure oil area is communicated with the oil in the lower low-pressure oil area.

Description

Variable Displacement Rotary Oil Pump

technical field

The invention relates to a rotor oil pump, in particular to a variable displacement rotor oil pump.

Background technique

At present, the oil pumps used in automotive internal combustion engines are generally fixed-displacement oil pumps, and the oil flow is proportional to the engine speed. The flow of this type of oil pump increases continuously with the increase of the engine speed. For a specific internal combustion engine, designers usually choose a large-displacement oil pump under the worst working conditions, that is, the oil pump corresponds to the low engine speed after determining the displacement, so that as the engine speed increases, the oil pump will The displacement of the oil pump increases accordingly. However, the lubrication of some parts of the engine does not need to increase the lubricating oil all the time as the engine speed increases. Doing so will increase the oil pressure in the engine oil passage and increase the oil temperature, which will affect the lubrication effect.

At present, there are also some variable displacement oil pumps. For example, the Chinese patent with the notification number CN 1766337A discloses a variable output rotor pump. The variable output rotor pump includes an inner driven rotor, an outer driven rotor, an inner drive rotor, outer drive rotor and annular output control ring. A control ring fits inside a circular bore in the pump body to vary the amount of working fluid delivered from the pump inlet to the pump outlet. Although this structure can change the displacement of the oil pump, this structure needs to install an oil pressure sensor that generates a pressure signal, and a controller connected to the oil pressure sensor needs to be installed to operate and control the flow of the oil pump through the function of the pressure signal . Such a structure is too complicated and there are too many electronic components, resulting in excessive engine load and increased cost.

The Chinese patent with the notification number CN 201284736Y discloses a variable flow rotor oil pump, which includes a housing, an inner rotor, a drive shaft, an outer rotor, and an adjusting rotor. The rotation of the adjusting rotor is driven by the oil pressure difference. . Although this structure can adjust the displacement of the oil pump, but at high speed, the oil pressure of the oil pump increases and the oil volume increases, and the pressure relief valve releases the pressure, so that the high-pressure oil directly flows back to the low-pressure oil area, so that part of the oil does useless work, and the engine has power loss. .

Contents of the invention

The invention provides a variable displacement rotor oil pump with simple structure and reduced engine power loss.

In order to achieve the above advantages, the present invention provides a variable displacement rotor oil pump, which includes a pump cover, a pump casing and a displacement adjustment structure arranged between the pump cover and the pump casing; it is characterized in that: The displacement adjustment structure includes a centrifugal adjustment mechanism, a first inner rotor, a first outer rotor, a second inner rotor, a second outer rotor and a rotating shaft; the variable displacement rotor oil pump also includes an intermediate cover plate, and the intermediate cover The plate is located between the pump cover and the pump casing; an upper oil chamber is formed between the pump cover and the middle cover plate, and the first inner rotor and the first outer rotor are matched and located on the upper Oil chamber; a lower oil chamber is formed between the middle cover plate and the pump casing, the second inner rotor and the second outer rotor are matched and located in the lower oil chamber, and the lower oil chamber is formed separately The lower high-pressure oil area and the lower low-pressure oil area; the centrifugal adjustment mechanism, the first inner rotor and the second inner rotor follow the rotation of the shaft, and when the rotation speed of the shaft is lower than a preset value, the The oil in the lower high-pressure oil area is isolated from the oil in the lower low-pressure oil area. When the rotational speed of the rotating shaft is higher than a preset value, the centrifugal adjustment mechanism pushes the rotating shaft and the second The inner rotor is lifted upwards, and the oil in the lower high-pressure oil area communicates with the oil in the lower low-pressure oil area.

In one embodiment of the present invention, the variable displacement rotor oil pump further includes a driving gear, which is connected to the rotating shaft and drives the rotating shaft to rotate, and the centrifugal adjustment mechanism is installed on the driving gear superior.

In one embodiment of the present invention, the centrifugal adjustment mechanism includes a centrifugal push rod and a centrifugal block, the centrifugal push rod includes a long rod and a short rod, the long rod and the short rod have an included angle, and the The connecting part of the long rod and the short rod is connected with the driving gear through a pin shaft, the long rod is close to the rotating shaft and abuts against the pump cover, and the centrifugal block is installed at the end of the short rod and away from the shaft.

In one embodiment of the present invention, the centrifugal adjustment mechanism further includes a support ball, the support ball is installed at the end of the long rod, and the long rod abuts against the pump cover through the support ball, During non-operation of the variable displacement rotary oil pump, the support ball is located between the pin shaft and the rotating shaft.

In one embodiment of the present invention, the pump cover has a top surface, and an accommodating groove is formed on the top surface, a limiting pressing plate is placed in the accommodating groove, and the rotating shaft passes through the limiting pressing plate , the support ball is in abutting contact with the limiting pressure plate.

In one embodiment of the present invention, the first inner rotor is connected to the rotating shaft through a positioning pin, the bottom of the first inner rotor is provided with a groove for accommodating one end of the positioning pin, and the positioning pin is connected to the rotating shaft. Leave a gap between the bottoms of the grooves.

In one embodiment of the present invention, the second inner rotor is integrally formed with the rotating shaft.

In one embodiment of the present invention, the second inner rotor includes a base plate and an inner rotor body, and the pump casing is provided with a supporting part separating the lower high-pressure oil area and the lower low-pressure oil area; when the variable displacement When the volume rotor oil pump is not working or the rotation speed of the rotating shaft is lower than the preset value, there is a gap between the base plate and the middle cover plate, and the inner rotor body is in close contact with the supporting part; when the When the rotational speed of the rotating shaft is higher than a preset value, the base plate is attached to the middle cover plate, and a gap is formed between the inner rotor body and the supporting portion.

In one embodiment of the present invention, the variable displacement rotor oil pump further includes a bottom end cover plate, the lower high-pressure oil area and the lower low-pressure oil area pass through the pump casing and are located between the second inner rotor and the second inner rotor. between the bottom cover plates.

In one embodiment of the present invention, the upper oil chamber is separated to form an upper high-pressure oil area and an upper lower-pressure oil area, and the variable displacement rotor oil pump further includes a pressure relief valve module, and the pressure relief valve module The group is set on the side of the upper and lower pressure oil area.

In one embodiment of the present invention, the pump cover is provided with a pressure relief hole on the side of the upper low-pressure oil area, and the pressure relief valve module includes a screw plug installed in the pressure relief hole, a return spring and one-way valve.

In one embodiment of the present invention, the variable displacement rotor oil pump further includes an oil outlet valve module, the oil outlet valve module is arranged on the side of the lower high-pressure oil area, and the oil outlet valve module includes check valve, when the speed of the rotating shaft is lower than the preset value, the oil in the lower high-pressure oil area flushes the check valve; when the rotating shaft speed is higher than the preset value, the lower The oil in the high-pressure oil area cannot flush open the one-way valve.

The variable displacement rotor oil pump of the present invention is divided into an upper oil chamber and a lower oil chamber through an intermediate cover plate. When the engine rotates at a low speed, the upper oil chamber and the lower oil chamber discharge oil at the same time; The oil discharge volume of the lower oil chamber also increases accordingly. When the engine speed reaches a preset value, through the action of the centrifugal adjustment mechanism, the lower high-pressure oil area and the lower low-pressure oil area of the lower oil chamber are connected, and the oil in the lower oil chamber If the liquid cannot pass through the one-way valve, the oil discharge from the lower oil chamber will fail, so as to prevent the oil discharge of the rotor oil pump from increasing with the increase of the engine speed. Compared with the prior art, the variable displacement rotor oil pump of the present invention has a simple structure and does not consume engine power.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

Fig. 1 is an exploded perspective view of a variable displacement rotor oil pump according to a preferred embodiment of the present invention.

Fig. 2 is a schematic perspective view of the pump cover shown in Fig. 1 .

Fig. 3 is a three-dimensional exploded schematic view of the displacement adjustment structure shown in Fig. 1 .

Fig. 4 is a three-dimensional exploded schematic diagram of another angle of the displacement adjustment structure.

Fig. 5 is an assembled sectional view of the displacement adjustment structure.

FIG. 6 is a perspective view of the middle cover shown in FIG. 1 .

Fig. 7 is a perspective view of the pump housing shown in Fig. 1 .

Fig. 8 is a state diagram of the rotor oil pump shown in Fig. 1 when it is running at a low speed.

Fig. 9 is a state diagram of the rotor oil pump shown in Fig. 1 when it is running at high speed.

Detailed ways

Please refer to FIG. 1 , a variable displacement rotor oil pump 100 according to a preferred embodiment of the present invention includes a pressure relief valve module 10 , a pump cover 20 , a displacement adjustment structure 30 , a driving gear 311 , an intermediate cover plate 40 , and a pump housing 50 , bottom end cover plate 60, oil inlet valve module 70.

The pressure relief valve module 10 includes a screw plug 12 , a return spring 14 and a one-way valve 16 .

The pump cover 20 has a bottom surface 21 and a top surface 29 , please refer to FIG. 2 , the bottom surface 21 is recessed to form an inner cavity 22 . An upper high-pressure oil area 24 and an upper low-pressure oil area 25 are arranged in the inner cavity 22 . The pump cover 20 is provided with a pressure relief hole 26 on one side of the upper low-pressure oil area 25 . The screw plug 12 , the return spring 14 and the one-way valve 16 are installed in the pressure relief hole 26 . The edge of the pump cover 20 is provided with several first positioning holes 27 , and a through hole 28 is provided in the middle. An accommodating groove 292 (please refer to FIG. 8 ) is formed on the top surface 29 , and the accommodating groove 292 communicates with the through hole 28 .

Referring to FIGS. 3 to 5 , the displacement adjustment structure 30 includes a centrifugal adjustment mechanism 31 , a first inner rotor 32 , a first outer rotor 33 , a second inner rotor 34 , a second outer rotor 35 and a shaft 36 .

The centrifugal adjustment mechanism 31 includes a pin shaft 312 , a centrifugal ejector rod 313 , a centrifugal block 314 , a support ball 315 , and a limiting plate 316 . The driving gear 311 is connected with the engine (not shown in the figure), and a plurality of fixing parts 311a are provided on the bottom surface thereof. The centrifugal push rod 313 includes a long rod 313a and a short rod 313b. The long rod 313a and the short rod 313b have an included angle. The connecting portion of the long rod 313a and the short rod 313b is pivotally connected with the driving gear 311 through a pin shaft 312. The long rod 313a Close to the rotating shaft 36 and against the pump cover 20 , the centrifugal block 314 is mounted on the end of the short rod 313 b and away from the rotating shaft 36 .

The middle part of the first inner rotor 32 is provided with a shaft hole 322 matched with the rotating shaft 36 . A groove 324 is formed at the bottom of the first inner rotor 32 , and the depth of the groove 324 is greater than the diameter of the second positioning pin 319 .

The first outer rotor 33 has a hollow portion 332 , the inner contour of the hollow portion 332 cooperates with the outer contour of the first inner rotor 32 to transfer oil from the upper low pressure oil area 25 to the upper high pressure oil area 24 .

The second inner rotor 34 includes a base plate 342 and an inner rotor body 344 . The base plate 342 is fixedly connected with the rotating shaft 36 . The inner rotor body 344 is located at the bottom of the base plate 342 and connected to the base plate 342 . In this embodiment, the second inner rotor 34 and the rotating shaft 36 are integrally formed.

The second outer rotor 35 has a hollow portion 352 , the inner contour of the hollow portion 352 cooperates with the outer contour of the inner rotor body 344 of the second inner rotor 34 to transfer oil.

The rotating shaft 36 defines a first pin hole 362 and a second pin hole 364 at intervals. The first pin hole 362 is close to the driving gear 311 for fixing one end of the first fixing pin 317 . The second pin hole 364 is close to the first inner rotor 32 for fixing one end of the second fixing pin 319 .

Referring to FIG. 6 , the middle cover plate 40 is provided with a middle oil inlet 41 and a middle oil outlet 42 . A plurality of second positioning holes 43 corresponding to the first positioning holes 27 are formed on the edge of the middle cover plate 40 .

Referring to FIG. 7 , the pump casing 50 has an upper surface 52 and a lower surface 51 . The pump housing 50 is partially hollowed out to form a lower high-pressure oil area 53 , a lower low-pressure oil area 54 and a supporting portion 59 , and the supporting portion 59 separates the lower high-pressure oil area 53 and the lower low-pressure oil area 54 . The supporting portion 59 has an upper surface 592 and a lower surface 594 , wherein the upper surface 592 is lower than the upper surface 52 of the pump casing 50 , and the lower surface 594 is flush with the lower surface 51 of the pump casing 50 . The pump casing 50 is provided with a bottom oil inlet hole 55 , a bottom oil outlet hole 56 and a high pressure oil inlet valve hole 57 . The bottom oil inlet hole 55 communicates with the lower low-pressure oil area 54 . The high-pressure oil inlet valve hole 57 communicates with the lower high-pressure oil area 53 and the bottom oil outlet hole 56 . A plurality of third positioning holes 58 are provided on the edge of the pump casing 50 , and the third positioning holes 58 correspond to the first positioning holes 27 and the second positioning holes 43 .

Referring to FIG. 1 again, the bottom cover plate 60 is provided with a main oil inlet 62 and a main oil outlet 64 . A plurality of fourth positioning holes 66 are formed on the edge of the bottom cover plate 60 , and the fourth positioning holes 66 correspond to the first positioning holes 27 , the second positioning holes 43 and the third positioning holes 58 .

The oil inlet valve module 70 includes a one-way valve 71 , a return spring 72 , and a screw plug 73 , and these parts are installed in the high pressure oil inlet valve hole 57 above the pump casing 50 .

When assembling, please refer to FIG. 1 to FIG. 9 , the shaft 36 passes through the shaft hole 44 of the middle cover 40 , and the middle cover 40 abuts against the base plate 342 of the second inner rotor 34 . One end of the second positioning pin 319 is fixed in the second pin hole 364 of the rotating shaft 36 . The first inner rotor 32 and the first outer rotor 33 are sleeved on the rotating shaft 36 , the bottoms of both are against the middle partition plate 40 , and the first inner rotor 32 is accommodated in the hollow portion 332 of the first outer rotor 33 . The other end of the second positioning pin 319 falls into the groove 324 , so that the first inner rotor 32 rotates together with the rotating shaft 36 . There is a gap between the top of the second positioning pin 319 and the bottom of the groove 324 , so that when the lifting distance of the rotating shaft 36 does not exceed the upper limit, the first inner rotor 32 will not be lifted up with the rotating shaft 36 . The rotating shaft 36 then passes through the shaft hole 28 of the pump cover 20, the bottom surface 21 of the pump cover 20 is attached to one side of the middle cover plate 40 and the first positioning hole 27 of the pump cover 20 is aligned with the second positioning hole 43 of the middle cover plate 40 .

Afterwards, the second outer rotor 35 is sleeved on the inner rotor body 344 of the second inner rotor 34 . The upper surface 52 of the pump casing 50 is attached to the bottom surface of the middle cover plate 40, the bottom end cover plate 60 is attached to the lower surface 51 of the pump casing 50, and the third positioning hole 58 of the pump casing 50 and the bottom end cover plate 60 The fourth positioning hole 66 is aligned with the first positioning hole 27 of the pump cover 20 and the second positioning hole 43 of the middle cover plate 40 . Then the cooperation of the bolt M with the first positioning hole 27, the second positioning hole 43, the third positioning hole 58 and the fourth positioning hole 66 will make the pump cover 20, the middle cover plate 40, the pump casing 50 and the bottom end cover plate 60 Fixed connection. At this time, the pump cover 20 and the middle cover plate 40 form an upper oil chamber (not shown in the figure), the first inner rotor 32 and the first outer rotor 33 are located in the upper oil chamber, and the upper high pressure oil area 24 and the upper low pressure oil area 25 Separated by the first inner rotor 32 and the first outer rotor 33; the middle cover plate 40 and the pump casing 50 form a lower oil chamber (not shown in the figure), and the second inner rotor 34 and the second outer rotor 35 are located in the lower oil chamber. The second inner rotor 34 is opposed to the supporting portion 59 of the pump housing 50 , and the lower high-pressure oil area 53 is isolated from the lower low-pressure oil area 54 .

The limiting pressing plate 316 is sleeved on the rotating shaft 36 and placed in the accommodating groove 292 , the limiting pressing plate 316 cannot rotate or move up and down with the rotating shaft 36 . One end of the first positioning pin 317 is fixed on the first pin hole 362 of the rotating shaft 36 . The swing member 310 is rotatably mounted on the fixed part 311a of the gear 311 through the pin shaft 312, and the centrifugal block 314 faces outward. The gear 311 and the oscillating member 310 are sleeved on the rotating shaft 36 , and the driving gear 311 is positioned through the retaining ring 318 for the shaft. The other end of the first positioning pin 317 falls into the slot 311 a (please refer to FIG. 8 ) of the driving gear 311 , so that the driving gear 311 can drive the rotating shaft 36 to rotate. The supporting ball 315 is in contact with the limiting plate 316 and is located between the pin shaft 312 and the rotating shaft 36 .

The total oil inlet 62 communicates with the bottom oil inlet 55 and the middle oil inlet 41 , and the total oil outlet 64 communicates with the bottom oil outlet 56 and the middle oil outlet 42 .

When the engine is running at low speed, please refer to FIG. 8 , the driving gear 311 drives the rotating shaft 36 to rotate, and the first inner rotor 32 and the second inner rotor 34 rotate together with the rotating shaft 36 . In the upper oil chamber formed by the pump cover 20 and the middle cover plate 40, the oil is transferred from the upper low-pressure oil area 25 to the upper high-pressure oil area 24 by the rotation of the first inner rotor 32 and the first outer rotor 33, and the oil is re- It flows out through the middle oil outlet 42. In the lower oil chamber formed by the middle cover plate 40 and the pump casing 50, when the variable displacement rotor oil pump 100 is not in operation or the rotation speed of the rotating shaft 36 is lower than a preset value, there is a gap between the base plate 342 and the middle cover plate 40 , and the inner rotor body 344 is close to the supporting part 59, thereby isolating the lower low-pressure oil area 54 and the lower high-pressure oil area 53; through the rotation of the second inner rotor 34 and the second outer rotor 35, the oil from the lower low-pressure oil area 54 is transferred to the lower high-pressure oil area 53, and the high-pressure oil in the lower high-pressure oil area 53 passes through the high-pressure oil inlet valve hole 57 and pushes back the check valve 71 of the oil inlet valve module 70, and the high-pressure oil flows into the main oil passage. It can be seen that when the engine is running at a low speed, the regulating structure 30 does not play a regulating role because of the low speed.

When the engine is running at high speed, please refer to Fig. 9, the same as when the engine is running at low speed: the driving gear 311 drives the rotating shaft 36 to rotate, and the first internal rotor 32 and the second internal rotor 34 rotate together with the rotating shaft 36; The upper oil chamber formed by the cover plate 40 transfers the oil from the upper low-pressure oil area 25 to the upper high-pressure oil area 24 through the rotation of the first inner rotor 32 and the first outer rotor 33, and then the oil flows out through the middle oil outlet 42 . The difference between when the engine is running at high speed and when the engine is running at low speed is that the centrifugal adjustment mechanism 31 starts to work: the increase of the engine speed causes the centrifugal force in the opposite direction of the line connecting the center of rotation of the centrifugal block 314 to increase, and the supporting ball 315 is far away from the rotating shaft 36, because the centrifugal push rod 313 is fixedly connected to the driving gear 311 through the pin shaft 312, so when the centrifugal block 314 is pulled outward, the driving gear 311 drives the second inner rotor 34 to move upward through the transmission of force; when the rotational speed of the rotating shaft 36 is higher than the preset When the value is high, the base plate 342 is attached to the middle cover plate 40, and the inner rotor body 344 forms a gap with the supporting part 59, so that the lower low-pressure oil area 54 communicates with the lower high-pressure oil area 53, so that the second inner rotor 34 and the second inner rotor 34 communicate with each other. Outer rotor 35 oil pump fails, and simultaneously the oil pressure of the oil in the lower high pressure oil area 53 is not enough to push back the check valve 71 of the oil inlet valve module 70, and the lower oil chamber has no high pressure oil to pump out. That is to say, when the engine is running at high speed, under the action of the centrifugal adjustment mechanism 31, the oil in the lower high-pressure oil area 53 in the lower oil chamber communicates with the oil in the lower low-pressure oil area 54, and the lower high-pressure oil area 53 communicates with the lower low-pressure oil. There is no pressure difference in the area 54, so the lower oil chamber does not pump oil, and the overall displacement of the oil pump 100 is reduced, so that the displacement of the oil pump 100 is variable.

Under normal circumstances, no matter whether the engine is running at high speed or low speed, the pressure relief valve module 10 remains in a closed state all the time, and the pressure relief valve module 10 will only be opened when the engine is overspeed.

It can be understood that the second inner rotor 34 and the rotating shaft 36 can also be separated, and the second inner rotor 34 is fixedly connected to the rotating shaft 36 through fixing pins or bolts.

It can be understood that the first inner rotor 32 can also be fixedly connected to the rotating shaft 36 by means of bolts or buckling.

The above description is only an embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with the embodiment, it is not intended to limit the present invention. Without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or be modified into equivalent embodiments with equivalent changes, but if it does not deviate from the technical solution of the present invention, the technical essence of the present invention can be used for the above Any simple modifications, equivalent changes and modifications made in the embodiments still fall within the scope of the technical solution of the present invention.

Claims (12)

1. A variable displacement rotor oil pump (100), comprising a pump cover (20), a pump casing (50) and a displacement pump arranged between the pump cover (20) and the pump casing (50) Adjustment structure (30); characterized in that: the displacement adjustment structure (30) includes a centrifugal adjustment mechanism (31), a first inner rotor (32), a first outer rotor (33), a second inner rotor (34) , the second outer rotor (35) and the rotating shaft (36); the variable displacement rotor oil pump (100) also includes an intermediate cover (40), and the intermediate cover (40) is located on the pump cover (20 ) and the pump casing (50); an upper oil chamber is formed between the pump cover (20) and the middle cover plate (40), and the first inner rotor (32) and the first outer rotor The rotor (33) is matched and located in the upper oil chamber; the lower oil chamber is formed between the middle cover plate (40) and the pump casing (50), and the second inner rotor (34) and the second The outer rotor (35) cooperates and is located in the lower oil chamber, and the lower oil chamber is separated to form a lower high-pressure oil area (53) and a lower low-pressure oil area (54); the centrifugal adjustment mechanism (31), the first An inner rotor (32) and the second inner rotor (34) follow the rotating shaft (36) to rotate, and when the rotational speed of the rotating shaft (36) is lower than a preset value, the lower high-pressure oil area (53) The oil in the lower pressure oil area (54) is isolated, and when the rotation speed of the rotating shaft (36) is higher than the preset value, the centrifugal adjustment mechanism (31) pushes the rotating shaft by centrifugal force (36) and the second inner rotor (34) are lifted upwards, and the oil in the lower high-pressure oil area (53) communicates with the oil in the lower low-pressure oil area (54). 2. The variable displacement rotor oil pump (100) according to claim 1, characterized in that: the variable displacement rotor oil pump (100) further comprises a driving gear (311), and the driving gear (311 ) is connected with the rotating shaft (36) and drives the rotating shaft (36) to rotate, and the centrifugal adjustment mechanism (31) is installed on the driving gear (311). 3. The variable displacement rotor oil pump (100) according to claim 2, characterized in that: the centrifugal adjustment mechanism (31) includes a centrifugal jack (313) and a centrifugal block (314), and the centrifugal jack The rod (313) includes a long rod (313a) and a short rod (313b), the long rod (313a) and the short rod (313b) have an included angle, and the long rod (313a) and the short rod ( 313b) is connected with the drive gear (311) through a pin (312), the long rod (313a) is close to the shaft (36) and abuts against the pump cover (20), the centrifugal A block (314) is mounted on the end of the stub (313b) away from the shaft (36). 4. The variable displacement rotor oil pump (100) according to claim 3, characterized in that: the centrifugal adjustment mechanism (31) further includes a support ball, and the support ball is installed on the long rod (313a) The end of the long rod (313a) abuts against the pump cover (20) through the support ball. When the variable displacement rotor oil pump (100) is not working, the support ball is located at the between the pin shaft (312) and the rotating shaft (36). 5. The variable displacement rotor oil pump (100) according to claim 4, characterized in that: the pump cover (20) has a top surface (29), and the top surface (29) is formed to accommodate groove (292), a limiting pressure plate (316) is placed in the accommodating groove (292), the rotating shaft (36) passes through the limiting pressing plate (316), and the supporting ball and the limiting pressing plate (316) Against contact. 6. The variable displacement rotor oil pump (100) according to any one of claims 1 to 5, characterized in that: the first inner rotor (32) is connected to the rotating shaft (36) through a positioning pin (319) ) connection, the bottom of the first inner rotor (32) is provided with a groove (324) for accommodating one end of the positioning pin (319), between the positioning pin (319) and the bottom of the groove (324) Leave gaps. 7. The variable displacement rotor oil pump (100) according to any one of claims 1 to 5, characterized in that: the second inner rotor (34) is integrally formed with the rotating shaft (36). 8. The variable displacement rotor oil pump (100) according to claim 7, characterized in that: the second inner rotor (34) includes a base plate (342) and an inner rotor body (344), and the pump casing (50) is provided with a supporting part (59) that separates the lower high-pressure oil area (53) from the lower low-pressure oil area (54); when the variable displacement rotor oil pump (100) is in non-working period or the When the rotation speed of the rotating shaft (36) is lower than the preset value, there is a gap between the base plate (342) and the middle cover plate (40), and the inner rotor body (344) is in close contact with the supporting portion (59) ; when the rotation speed of the rotating shaft (36) is higher than the preset value, the base plate (342) is in contact with the middle cover plate (40), and the inner rotor body (344) is in contact with the supporting part (59) to form a gap. 9. The variable displacement rotor oil pump (100) according to any one of claims 1 to 5, characterized in that: the variable displacement rotor oil pump (100) further comprises a bottom cover plate (62) , the lower high-pressure oil area (53) and the lower low-pressure oil area (54) pass through the pump casing (50) and are located between the second inner rotor (34) and the bottom end cover plate (62). 10. The variable displacement rotor oil pump (100) according to any one of claims 1 to 5, characterized in that: the upper oil chamber is separated to form an upper high pressure oil area (24) and an upper lower pressure oil area (25 ), the variable displacement rotor oil pump (100) further includes a pressure relief valve module (10), and the pressure relief valve module (10) is arranged on the side of the upper and lower pressure oil area (25). 11. The variable displacement rotor oil pump (100) according to claim 10, characterized in that: the pump cover (20) is provided with a pressure relief hole (26) on the side of the upper and lower pressure oil area (24), The pressure relief valve module (10) includes a screw plug (12), a return spring (14) and a one-way valve (16) installed in the pressure relief hole (26). 12. The variable displacement rotor oil pump (100) according to any one of claims 1 to 5, characterized in that: the variable displacement rotor oil pump (100) further includes an oil outlet valve module ( 70), the oil outlet valve module (70) is set on the side of the lower high pressure oil area (53), the oil outlet valve module (70) includes a check valve (71), when the shaft (36) When the rotation speed is lower than the preset value, the oil in the lower high-pressure oil area (53) flushes the check valve (71), and when the rotation speed of the rotating shaft (36) is higher than the preset value, the lower The oil in the high-pressure oil area (53) cannot flush the check valve (71).

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